That's a big NAS. You must already possess or plan to rip a lot more movie files than I would ever find time to watch!
If you are asking me whether the use of a NAS makes a difference to the directory structure for your media files then my answer would be no. I originally stored my music files on the disks fitted to my desktop PC and this structure was simply copied to my NAS under the 'music' shared folder. I can provide the exact details of this music folder structure if you want but it can be summarised as being focused on filing by composer name for classical CDs devoted to a single composer or under the heading of 'Classical compilations' for multiple composer CDs. Non-classical CDs are filed under the artist or band name. If I had any non-classical compilation CDs featuring a range of different artists then I would create a top level folder for that category. Under these high level folders, everything is stored within dedicated album folders (multiple disk albums are stored under a single album folder).
My MKV rips of DVDs and Blu-rays are stored within dedicated folders for each movie. These folders are either stored under 'Movies' or 'Music videos' and those two high level folders sit within the 'video' shared folder. The common theme in my choice of file directory structure for both music and video is to retain a clear connection to the original shiny disk.
The serving of the media files from my NAS is done using Synology's own Media Server app for video and MinimServer for music. I think I just used the default settings for Media Server but MinimServer (which has many benefits for classical music) requires a bit more initial work to get the best out of it. I have a proper metadata tag process in place for all my music (with these tags stored in the FLAC files) but have not yet fully developed a tagging scheme for my video files. I only bought my NAS boxes a few weeks ago and most of my video collection has still to be ripped.
I won't say any more until it is clearer which part of the process you are struggling with. Overall, this can be a very confusing topic and this forum has proved invaluable for clearing the fog from my own head!
Thanks for the detailed explanation of your NAS setup. My struggle(all my life actually) is that I'm a visual learner ... I see a picture of something and then I understand it. That's why I failed dynamic mechanics classes in college where I was required to imagine weird 2D objects on flat surfaces and then draw their 3D projections in space. Let's just say I was courteously given a passing grade out of sympathy and was made to promise never to become a mechanical engineer. I heartily agreed.
If you could show a pic of how you've arranged your directories by composer, album, movie name, actor or whatever on your computer, that would be of great help.
Thanks for your help David ..,